Main Chain CH3 CH3 CH3 CH- CH2 CH3 CH CH2 CH CH- CH2CH3 CH- CH2CH: CH3 CH-CH3 CH3 CH- CH3 CH3 CH3 wrong correct seven-carbon chain,but only three substituents seven-carbon chain,four substituents 203 Pearsdn Educalion.inc When there are two longest chains of equal length,use the chain with the greatest number of substituents. 2013 Pearson Education,Inc. Chapter 3 12© 2013 Pearson Education, Inc. Main Chain When there are two longest chains of equal length, use the chain with the greatest number of substituents. Chapter 3 12